TABLE OF CONTENTS Incorporation of quality control measures during all aspects of an acid job can make the difference between success and failure. Quality control monitoring during the actual pumping of the treatment only is not sufficient. In addition, quality control steps must be planned and executed during rig-up of equipment, before pumping, and after pumping.
As mentioned in chapter 6, a number of years ago, King and Holman of the Amoco Production Company authored a booklet entitled Acidizing Quality Control at the Wellsite. [1] A section of that booklet details the steps that should be taken to ensure the quality of an acidizing treatment. Their recommendations (italicized in the following sections) still apply today. This chapter presents a modified version of the quality control steps presented in that booklet, with commentary.
[1]King, G. E., and G. B. Holman. 1982. Acidizing Quality Control at the Wellsite. Tulsa: Amoco Production Research Co.
Inspect all tanks that will be used to hold acid or water. The tanks must be clean. Small amounts of dirt, mud, or other debris can easily ruin an acid job.
I once attended a treatment in a well in Alaska's Cook Inlet in which the preflush tank (actually a cement tank) contained debris from a cement job pumped earlier in another well on the same platform. The treatment was unsuccessful. It was speculated that cement material present in the preflush...
